“Give my regards to Broadway.” That’s a good line to remember when you want to know when to use the expressions “regard to” and “regards to.” The phrase regard to means regarding or pertaining. But, when you give regards, you are saying hello.
This is in regards to the note I sent.
I’m answering in regards to your concern.
This is in regard to the note I sent.
I’m answering in regard to your concern.